Start-up circuit

Details Start-up circuit Start-up circuit

1979-09-12

1981-07-07

Shoop, William M.

Electric power conversion systems

Current conversion

With starting arrangement

363 20, 323901, H02M 3335

Patent

active

042778247

ABSTRACT:
A start-up circuit includes a capacitor which is initially charged by the AC line voltage. When the voltage across the capacitor is sufficient to breakdown a zener diode and overcome the gate to cathode voltage drop of an SCR, the SCR snaps on applying the capacitor voltage to a user circuit which generates a pulse train. The pulse train is applied to a switching device which induces a voltage in a transformer which is fed back to the capacitor and filtered to maintain the SCR in an on state.

REFERENCES:
patent: 3231833 (1966-01-01), Cooper
patent: 3863132 (1975-01-01), Meeker
W. A. Moorman, "Transistor Switching Regulator Start Circuit", IBM Technical Disclosure Bulletin, vol. 13, No. 9, Feb. 1971, pp. 2763-2764.

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